Java 3DES 加密 解密 示例   发布时间:2017-09-02 11:35:42

Java 3DES 加密 解密 示例


package des3;

import java.io.IOException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

@SuppressWarnings("restriction")
public class TripleDESTest {

/**
* 根据参数生成Key;
*
* @param strKey
*/
private Key getKey(String strKey) {
Key key = null;
try {
KeyGenerator _generator = KeyGenerator.getInstance("DES");
_generator.init(new SecureRandom(strKey.getBytes()));
key = _generator.generateKey();
_generator = null;
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
return key;
}

/**
* 获得一次3DES加密后的密文
*
* @param
* @return strMi
*/
public String getEncString(String strMing, String strKey) {
byte[] byteMi = null;
byte[] byteMing = null;
String strMi = "";
Key key = getKey(strKey);
BASE64Encoder encoder = new BASE64Encoder();
try {
byteMing = strMing.getBytes("utf-8");
byteMi = getEncCode(byteMing, key);
strMi = encoder.encode(byteMi);
} catch (Exception e) {
e.printStackTrace();
} finally {
encoder = null;
byteMi = null;
byteMing = null;
}
return strMi;
}

/**
* 获得两次3DES加密后的密文
*
* @param
* @return strMi
*/
public String getTwiceEncString(String strMing, String strKey) {
return getEncString(getEncString(strMing, strKey), strKey);
}

/**
* 获得一次3DES解密后的明文
*
* @param
* @return strMing
*/
public String getDecString(String strMi, String strKey) {
BASE64Decoder base64Decoder = new BASE64Decoder();
byte[] byteMing = null;
byte[] byteMi = null;
String strMing = "";
Key key = getKey(strKey);
try {
byteMi = base64Decoder.decodeBuffer(strMi);
byteMing = getDecCode(byteMi, key);
strMing = new String(byteMing, "utf-8");
} catch (IOException e) {
e.printStackTrace();
} finally {
base64Decoder = null;
byteMing = null;
byteMi = null;
}
return strMing;
}

/**
* 获得两次3DES解密后的明文
*
* @param
* @return strMing
*/
public String getTwiceDecString(String strMi, String strKey) {
return getDecString(getDecString(strMi, strKey), strKey);
}

/**
* 获得一次3DES加密后的密文
*
* @param byts
* @return
*/
private byte[] getEncCode(byte[] byts, Key key) {
byte[] byteFina = null;
Cipher cipher;
try {
cipher = Cipher.getInstance("DES");
cipher.init(Cipher.ENCRYPT_MODE, key);
byteFina = cipher.doFinal(byts);
} catch (Exception e) {
e.printStackTrace();
} finally {
cipher = null;
}
return byteFina;
}

/**
* 获得一次3DES解密后的明文
*
* @param bytd
* @return
*/
private byte[] getDecCode(byte[] bytd, Key key) {
byte[] byteFina = null;
Cipher cipher = null;
try {
cipher = Cipher.getInstance("DES");
cipher.init(Cipher.DECRYPT_MODE, key);
byteFina = cipher.doFinal(bytd);
} catch (Exception e) {
e.printStackTrace();
} finally {
cipher = null;
}
return byteFina;
}

public static void main(String[] args) {
TripleDESTest td = new TripleDESTest();
Key k = td.getKey("Key");
System.out.println("获得的密钥key是:" + k);
String encyStr = td.getEncString("Test", "Key");
System.out.println("一次加密后的密文是:" + encyStr);
String decyStr = td.getDecString(encyStr, "Key");
System.out.println("一次解密后的明文是:" + decyStr);
encyStr = td.getTwiceEncString("Test", "Key");
System.out.println("两次加密后的密文是:" + encyStr);
decyStr = td.getTwiceDecString(encyStr, "Key");
System.out.println("两次解密后的明文是:" + decyStr);
}

}

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